Yamato VF2400 class User manual

Instruction Manual
This instruction manual includes adjustments differed from VF2400.
Before using your machine mentioned above, please read both of
the instruction manuals and understand the contents well.
After reading the instruction manual, please keep it in a location
where it is easily accessible to the operator.
HIGH SPEED FLAT BED INTERLOCK STITCH MACHINE
VF2400 class

CONTENTS
Safety instructions ⅰ - iv
1. Name of each part 1
2. Installation 2
2.1 Semi-submerged type 2
2.2 Full-submerged type 5
2.3 Motor, pulley and belt 8
2.4 Hanging belt 9
2.5 Belt cover 9
2.6 Eye guard and 󲶻nger guard 10
2.7 Thread guide plate 10
2.8 Tape stand (VF2403, 2404, 2503, 2504) 11
2.9 Tape holder (VF2404, 2504) 11
3. Sewing speed and rotating direction of pulley 12
4. Lubrication 13
4.1 Lubricating oil 13
4.2 Lubricating 13
4.3 Changing oil 14
4.4 Checking and replacing oil 󲶻leter 14
5. Proper operation 15
5.1 Needle system 15
5.2 Installing needles 15
5.3 Threading 16
5.4 Adjusting thread tension 17
5.5 Pressure of presser foot 17
5.6 Adjusting position of presser foot 17
5.7 Adjusting differential feed dog 18
5.8 Adjusting stitch length 19
5.9 HR device and SP device 20
5.10 Setting tape (VF2403, 2503, 2404, 2504) 21
5.11 Metering device (only for VF2404 and VF2504) 21
5.12 Adjusting hemming guide (VF2411) 23
5.13 Cleaning the machine 23

CONTENTS
Attention
The parts used for this product are subject to change without notice. If such a change is made, any part
of the contents and illustrations of this instruction manual may not conform to this product.
In preparing the instruction manual, we have made our best efforts for making it free of any error or
omission. If any error or omission should yet be found, it might not be rectified immediately.
Attention
◇This instruction manual is designed mainly for technicians, but it is advisable that also operators read
the instructions with mark to use the machine properly.
◇The numbers in lower left corners of figures are figure numbers. We use them in texts as needed for
your reference.
6. Adjustments 24
6.1 Needle thread tension 24
6.2 Top cover thread tension 25
6.3 Looper thread tension 26
6.4 Removing presser foot and presser foot lift 27
6.5 Looper 28
6.6 Height of needle bar 29
6.7 Front-and-rear position of needle and looper 30
6.8 Needle and needle guard 31
6.9 Height of feed dog 32
6.10 Needle and spreader 32
6.11 Folder (VF2403, 2503, 2404, 2504) 34
6.12 Metering device (VF2404, 2504) 35
7. Specifications 37

i
Safety instructions
２．Installation and preparation
2-1 Instruction and training
Operators and workers, who supervise, repair or
maintain the machine head and machine unit, are
required to have the adequate knowledge and op-
eration skills to do the job safely. In order to
establish such necessary conditions, it needs
for the employer to plan and enforce the safety
education and training to those workers.
2-2 Sewing table and motor
(1) Prepare a machine table that has enough
strength to withstand the weight of the sew-
ing head and any reaction while operating.
(2) Maintain a comfortable working environment
with considering the lighting and the ar-
rangement of sewing machine so that the op-
erators can work smoothly.
(3) When installing the control box and the re-
lated parts on the sewing machine, take care
about the posture of the worker.
(4) Install the drive unit correctly according
to the instruction manual.
2-3 Wiring
(1) Never connect the plug for power supply un-
til assembly is 󲶻nished.
(2) Fix the connectors securely to the sewing
machine head, motor, and electric apparatus.
(3) Do not apply excessive force to the connec-
tion cords.
(4) Connect the cords away from the driving
parts.
(5) Place the ground wire securely to the desig-
nated position on the machine head.
2-4 Before operation
(1) Take care not to attach lubricant, silicone
oil, and grease on the eyes or skin.
Keep them away from children.
(2) Be sure to 󲶻ll or drop lubrication oil be-
fore operating the sewing machine.
Use the Yamato SF oil as speci󲶻ed.
(3) Never put your hand under the needle or near
the moving parts of the machine when turning
on power supply switch.
１． To ensure safe use
Always observe the following instructions to en-
sure the safe use of the industrial sewing ma-
chines and devices.
1-1 Application and purpose
The sewing machine is designed to improve pro-
ductivity in the sewing industry and must not be
used for other applications and purposes. Do not
use this sewing machine until it can be con󲶻rmed
that safety measures for the drive units have
been taken.
1-2 Before use
Read all instruction manuals thoroughly before
starting the use of this machine and follow
them.
Also, read the instruction manual for the installed
drive unit.
1-3 Working environment
DO NOT WORK IN THE FOLLOWING ENVIRONMENTS:
- Place where atmosphere temperature and humid-
ity give a bad influence the performance of
sewing machines.
- Outdoors and place where the sewing machines
are exposed to sunlight directly.
- Atmosphere containing dust, corrosive gases or
󲶼ammable gases.
- Place where voltage 󲶼uctuation exceeds ± 10 %
of the rated voltage.
- Place where power capacity necessary for the
used motor speci󲶻cations cannot be secured.
- Place where strong electric or magnetic 󲶻elds
are generated such as near large-output high
frequency transmitters or high frequency weld-
ing machines.
1-4 Unpacking and transportation
(1) Unpack from the top.
(2) Never hold the parts near the needle or
threading parts when removing the sewing ma-
chine head from the buffer of box.
(3) When carrying the sewing machine head, have
an assistant.
(4) Pay attention not to get excessive impact or
shock when moving the sewing machine head
with a pushcart.

ii
Safety instructions
３．Maintenance, inspection, and repair
(1) Follow the instruction manuals for mainte-
nance, inspection, and repair.
(2) Entrust the maintenance, inspection, and re-
pair to specially trained personnel.
(3) Be sure to turn off the power supply switch
and make sure the sewing machine and motor
completely stop before the maintenance, in-
spection, and repair. (If using a clutch mo-
tor, take care that the motor keeps turning
for a while even after turning off the power
supply switch.)
(4) Be sure to remove the gasket too, when the
cover removed at the maintenance, inspec-
tion, and repair. If not removed, may be
injured at the edge of gasket.
(5) Do not modify the sewing machine by the
customer's judgment.
(6) Be sure to use original replacement parts
for repairs or maintenance.
４． Caution signs and alert pictorial markings
This instruction manual contains the following
caution signs and alert pictorial markings to
prevent you from injuring yourself or the sew-
ing machine from being damaged.
Please follow the instructions.
4-1 Meanings of caution signs
WARNING indicates potentially hazardous situ-
ations which, if not heeded, could result in
death or serious injury to you and others.
Caution indicates hazardous situations which,
if not heeded, may result in minor or moderate
injury to you and others, or may result in ma-
chine damage.
NOTE is used to emphasize essential informa-
tion.
(4) When operating a new sewing machine, make
sure the rotating direction of pulley agrees
with the rotating-direction mark.
2-5 During operation
(1) Be sure to operate the sewing machine with
the safeguards such as belt cover, finger
guard, and eye guard.
(2) Never place the 󲶻nger, hair or objects un-
der the needle or close to the moving parts
while operating the sewing machine.
(3) Be sure to turn off the power supply switch
when threading or replacing the needles.
(4) Never place your hands close to the knives
when operating the sewing machine with the
trimming devices.
(5) Be sure to turn off the power supply switch
when terminating the sewing work or leaving
the sewing machine.
(6) If the sewing machine malfunctions, abnormal
sound or smell something unusual while oper-
ating, be sure to turn off the power supply
switch.
2-6 Removal
(1) Turn off the power supply switch if removed
or replaced any parts or during adjustment
of sewing machine.
(2) Do not pull the cord when removing the plug.
Be sure to hold the plug itself.
(3) A high voltage is applied inside the control
box. Turn off the power supply switch and
wait more than 5 minutes before opening the
cover.

iii
Safety instructions
4-2 Alert pictorial markings
５．Warning labels on sewing machines
This mark indicates the warning
which, if not heeded, could re-
sult in death or Serious injury.
This mark indicates the warning
which, if not heeded, could re-
sult in death or Serious injury.
High-voltage applies in the
control box. This label indi-
cates that electric shock may be
caused.
This mark indicates the caution
which, if not grounded, the ma-
chine or device could malfunc-
tion and could result in per-
sonal injury.
This mark indicates the caution
for high temperature.
This label indicates
that removal of the
safeguards and works
except for sewing per-
formance while the
power supply switch
is on are prohibited.
(For details, see the
next page.)
High-voltage applies
in the control box.
This label indicates
that electric shock
may be caused.
This label is af󲶻xed on the
safeguards. Considering the
operation, it is not affixed
on the finger guard and eye
guard. Be sure to operate
with the 󲶻nger guard and eye
guard in position.
Stepping motor and solenoid
may overheat if used con-
tinuously. To prevent a burn,
take care not to touch.
Check the rotating
direction of machine
pulley agrees with '
ROTATING-DIRECTION
SYMBOL'.
If not connected earth line,
static electricity may be
generated and inflict injury
on person. In addition, the
malfunction of electric sys-
tem may cause injury to per-
son.

iv
Safety instructions
Rotating direction symbol

1
VF2400
1. Name of each part
Fig. 1-1
Thread guide plate
Handwheel
Seal plug(lubrication)
SP device
Oil sight window
Needle bar cover
Presser spring
regulator
Needle thread
take-up guard
Feed regulating
pushbutton
Side cover
Differential feed
graduation
Finger guard
Presser foot
Eye guard
Front cover
Supporting plate for
looper thread take-up
Oil sight gauge
Looper thread
take-up cover
Thread tension
spring cap

2
VF2400
2.1 semi-submerged type
2. Installation
2.1.1 Table cutting diagram
Fig. 2-1
Standard
Table dimensions: 1200×595×40
Operator
center of pulley
Refer to the instruction manual of the motor for dimensions A, B, C, and D.
Section Y -Y (1/2)
Section X -X (1/2)

3
VF2400
2. Installation
With UT device
Fig. 2-2
Refer to the instruction manual of the motor for dimensions A, B, C, and D.
Section Y -Y
Section X - X
Operator
Table dimensions: 1200×595×40
center of pulley
3- φ 9.5 installing hole of motor

4
VF2400
2. Installation
2.1.2 Installation
Fig. 2-3
Install a machine correctly referring to Figs. 4 and 5.
Set the screws ② in the supporting board ① and cover the
screws ② with the rubber cushions ③ . Fix the the sup-
porting board ① to the machine table and install a machine
securely on the rubber cushions ③ .
☆ The number of spacers ④
VF2400 class
s e w i n g
machine
machine table
Fig. 2-4
①
④
4 ㎜
④
③
③
③
②
②
①
Thickness of table The number of spacers ④
40 ㎜ 3 pcs. ×４＝ 12 pcs.
45 ㎜ 2 pcs. ×４＝８ pcs.
50 ㎜ １ pc. ×４＝４ pcs.
Table 1

5
VF2400
2. Installation
2.2 Full-submerged type
2.2.1 Table cutting diagram
Fig. 2-5
Refer to the instruction manual of the motor for dimensions A, B, C, and D.
center of pulley
Table dimensions: 1200×595×40
Operator
3- φ 9.5 installing hole of motor
Section H - H
Section G - G
Section F - F
Section E - E
magnet
magnet
magnet
Table
Supporting board
Note: 125 is reference dimension which differ by kindes of the motor.
“155” in the above 󳞛gure is the distance to the bottom of the supporting board so it must be set to the dimension where there will be no interference between the motor control panel and the bottom and back end of the supporting board.
Note: Position of the rear end of supporting board
Note: (125)
Magnet : Shown in the diagram are the reference positions where the magnet catches are to be installed.

6
VF2400
2. Installation
Fig. 2-6
Fig. 2-7
Supporting board
Auxiliary table
thickness 20 ㎜
thickness 35 ㎜

7
VF2400
2. Installation
Fig. 2-8
Install a machine correctly referring to Figs. 2-8 and 2-9.
Set the screws ② in the supporting board ① and cover the
screws ② with the rubber cushions ③ . Fix the the sup-
porting board ① to the machine table and install a machine
securely on the rubber cushions ③ .
2.2.2 Installation
Fig. 2-9
machine
table
①
①
②
③

8
VF2400
2. Installation
2.3 Motor, pulley and belt
Fig. 2-10
Table 2
M type of V-belt
58 ㎜
5.5 ㎜
10 ㎜
40°
See the instruction manual for the motor used and install
the motor properly.
Clutch motor:
To install the clutch motor, align the center of the machine
pulley with that of the motor pulley when the motor pulley
shifts to the left while toeing down the pedal.
Note: Table 2 shows the outside diameter of the motor
pulley, sewing speed of the machine, and size of the
belt when using a clutch motor of 3-phase, 2-pole,
550 W (3/4 HP).
The outside diameter on the table shows the near-
est size to the calculated values based on the com-
mercial available pulleys at intervals of 5 mm.
Use only those motor pulleys applicable to the machine. If
not applicable, the sewing machine will be over maximum
and it can cause the damage to the machine.
Servomotor:
Use a servomotor with 500 W or more.
Calculate the outside diameter of a motor pulley from the
formula as below.
Or see Table 3 to select a proper motor pulley.
Outside diameter Usual sewing speed
of motor pulley Servomoter speed
= × 58 + 5 mm
Table 3
Outside
diameter of
pulley
(㎜)
Sewing speed
of machine
(sti/min)
Belt size
50 Hz 60 Hz Table top Semi-
submerged
80 4500 M33 M34
85 4800 M33 M34
90 5100 M34 M35
95 4500 5350 M34 M35
100 4800 5650 M34 M35
105 5000 5950 M35 M36
110 5250 6200 M35 M36
115 5500 6500 M35 M36
120 5750 6800 M36 M37
125 6000 M36 M37
130 6200 M36 M38
135 6450 M37 M38
140 6700 M37 M38
145 6950 M38 M39
Sewing speed
of machine
(sti/min)
Outside diameter of motor pulley
(mm)
rpm of servomotor
3000 rpm 3600 rpm
4200 86 73
4500 92 78
4700 96 81
5000 102 86
5200 106 89
5500 111 94
5800 117 98
6000 121 102
6200 125 105
6500 131 110
7000 140 118

9
VF2400
2. Installation
2.5 Belt cover
2.4 Hanging belt
①
②
③
④
Fig. 2-11
Fig. 2-12
⑤
10 - 20 ㎜
Use the M-type of V-belt.
(1) Hang the belt ① on the machine pulley ② , and then
on the motor pulley ③ while rotating the machine pul-
ley.
(2) Adjust the belt tension so that the belt has a slack of
10 - 20 mm when its center is pushed with 10 N.
(3) Lock the motor with the adjusting bar ④ .
Before hanging belt, ALWAYS turn the power switch OFF
and check that the machine has already stopped.
Set the belt cover ⑤ . (Fig. 2-12)

10
VF2400
(1) Put the screws ③ into the hole of the thread
guide plate ④ and push it to the left.
(2) Fix the thread guide plate ④ with the screws ③ se-
curely.
2. Installation
2.6 Eye guard and finger guard
To ensure safe use, always install the eye guard ① and the
󳞛nger guard ② on the prescribed position when operating.
Fig. 2-13
2.7 Thread guide plate
Fig. 2-14
①
②
③
④

11
VF2400
2. Installation
2.8 Tape stand (VF2403, 2404, 2503, 2504)
①
①
③
②
Fig. 2-15
Fig. 2-16
2.9 Tape holder(VF2404, 2504)
Fig. 2-17
④
⑤
⑥
⑦
⑧
(1) Set the tape stand (Fig. 2-15).
(2) Fix the tape stand on the machine table with the wood
screws ① (Fig. 2-16).
(3) Adjust the direction of the tape guide bar ③ to feed a
tape into the folder ② smoothly.
Set the tape holder ④ on the screw ⑦ of the top cover
and the screw ⑧ of the head cover with the screws ⑤⑥
respectively.

12
VF2400
3.
Sewing speed and rotating direction of pulley
Table 4 shows maximum sewing speed and usual speed for
each model.
Run a new machine at speed about 15 - 20% lower than
maximum speed during the 󳞛rst 200 hours (for about one
month) so that a machine can offer a long service life in
good condition.
The rotating directions of the machine pulley ① and the
handwheel ② are clockwise as shown in the 󳞛gure.
Fig. 3-1
If rotated in reverse direction, oil cannot be supplied
properly. It can cause the damage to the machine.
Table 4
①
②
Model Max. speed
(sti/min)
Usual
speed
(sti/min)
VF2400, 2500 (with spreader) 6500 6000
VF2403, 2503 (with spreader） 6000 5500
VF2404, 2504 (with spreader） 5000 4500
VF2411 (without spreader) 7000 6500
VF2530 (with spreader) 5500 5000

13
VF2400
4. Lubrication
4.1 Lubricating oil
4.2 Lubricating
Use YAMATO SF OIL No. 28.
When using a new machine, or a machine which has not
been run for a while, supply a few drops of oil to the needle
bar ① .
Remove the seal plug ② indicated “OIL-IN” and supply oil
to the upper line of the oil sight gauge ④ .
Check that oil splashes from the nozzle inside the oil sight
window ③ while running a machine.
If oil does not splash from the nozzle, see “4.4 Checking
and replacing oil 󳞛lter” on page 14.
Before lubricating, ALWAYS turn the power switch OFF and check that the machine has already stopped.
Never add additives to the oil.
If added, it can cause the deterioration of the oil and the
damage to the machine.
Too much or insufficient oil can cause oil leakage and
machine trouble. Be sure to keep the oil level between
the lines. Also too much lubrication can cause the oil
scatter and material stain.
Fig. 4-1
Fig. 4-2
Fig. 4-3
①
②
③
④